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Data based on a 5
data(phbirths)
A data frame with 1115 observations on the following 5 variables.
black
is the mother Black?
educ
mother's years of education
smoke
does the mother smoke during pregnancy?
gestate
gestational age in weeks
grams
birth weight in grams
data(phbirths) ## maybe str(phbirths) ; plot(phbirths) ...
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